Effects of waste frying oil based methyl and ethyl ester biodiesel fuels on the performance, combustion and emission characteristics of a DI diesel engine

• Published in: Fuel (Guildford) 2015-11, Vol.159, p.179-187
• Main Authors: Sanli, H., Canakci, M., Alptekin, E., Turkcan, A., Ozsezen, A.N.
• Format: Article
• Language: English
• Subjects: Emissions; Engine performance; Ethyl ester; Methyl ester; Waste frying oil
• ISSN: 0016-2361; 1873-7153
• DOI: 10.1016/j.fuel.2015.06.081

•A complete biological origin biodiesel fuel was produced using bioethanol.•Brake specific fuel consumption and thermal efficiencies of ester fuels were higher than petro-diesel.•Ester fuels emitted less CO and THC emissions, but higher NOx and CO2 than petro-diesel.•Ethyl ester had slightly better engine performance than methyl ester.•Ethyl ester had superior exhaust emissions over methyl ester. In this study, fuel quality biodiesels produced from waste frying oil using methanol and ethanol were tested as pure and 20% (v/v) blend with petroleum-based diesel fuel (PBDF) in a direct injection (DI) diesel engine running at 600Nm and three different engine speeds (1100, 1400 and 1700rpm). The results showed that the brake specific fuel consumptions (BSFC) of ester fuels were higher than those of petrodiesel. The BSFC of ethyl ester biodiesel was slightly lower as compared with methyl ester biodiesel. The thermal efficiencies of the ester fuels were higher than those of PBDF. Ethyl ester biodiesel had slightly better thermal efficiency than methyl ester biodiesel. In comparison to PBDF, ester fuels emitted less CO and THC emissions but they caused to produce more NOx. CO2 emissions were very close to each other. In general, ethyl ester biodiesel released relatively less emissions than methyl ester biodiesel.